Not sure that your first sentence is strictly accurate, i certainly have been getting sales (not on here though) and plenty of interest.  More depends on what you are asking for the items, so many want something for nothing!  I could have sold loads more if i accepted all the offers (some ridiculous i may add) that are made.   Then again most of my things are clothing whereas the OPs  are ceramics (which i have a few of and they are not selling either).  So maybe just the type of item rather than other reasons.  Car boots will be starting soon so i will clear a lot of that stuff there with impulse buyers.